Loud-speaking telephonic apparatus



May 12, 1925.

1,537,347 E, A. GRAHAM LOUD SPEAKING TELEPHONIC APPARATUS Filed June 30,1924 2 Shoots-Shut l May I2, -T925.

E. A. GRAHAM LOUD SPEAKING EELZPHONIC APPARATUS 2 Sheets-Sheet 2 FiledJune so, 1924 IT? enter mam/Madam M 14ml,

fittorneys "Patented May 12, 1925.

sputum) Amnnn' oneness. or snooscrnv, Lennon, EEGLAHI),

LOUD-SPEAKING TELEPliGNIC APPARATUS.

Application filed June 30, 1924. Serial No. 723,383.

'1 all whom it may concern.

Be it known that I, EDWARD ALFRED Gee- HAM, a subject of the' King ofGreat Britain and Ireland, residing at Brockley, in the county ofLondon, England, have invented Improvements in or Relating to Loud-Speaking Telephonic Apparatus, of which the following is aspecification.

This invention has reference to portable 0 loud speakin telephonicapparatus and it has for its o ject to provide apparatus of this typeth'at can be easily transported from place to pltce and convenientlyused in the open air inxponnection with wireless receiv- 5 ingapparatus, as for instance boating and other parties, like.

For this purpose, portable loud speaking telephonic apparatus accordingto the-1nvention, comprises a case having one or more movable si'des'ordoors and it may be a movable top or cover, and a loud speakingtelephone comprising a telephonic receiver and a sound conduit orresonating box or chamber the mouth or sound emission aperture of whichis adapted completely to occupy the opening, or one of theopeningsnormally closed by a movable side or door, when the loudspeaking telephone is not in clubs and the The case may be provided withsupport ing means capable of being attached to and detached from thecase, or hinged or jointed thereto. and whereby the case with loudspeaking telephone can ,conveniently be erected rand supported inposition for use "and which c'an b i ren'ioved from, or folded upagainst the case for storage or transport.

The loud speaking telephone may be adapted foslide in the case, so thatit can be withdrawn, Wholly or partly, through the opening at the frontof the case, or through an opening at the back of the case, to permit ofadjustment of the telephonic receiver. Or the case may be provided witha hinged or removable top or cover to admit or": the combined telephonicreceiver and the attached sound conduit or resonating box or chamber(hdrcinafter called the sound conduit) being readily inserted inthe'case from above and of the telephonic receiver beingafterwards'readily adjusted, when desired, without removing it and thesound conduit from the case. Or, for these purposes, the

case may be provided with a hinged or reby picnic,

movable side wall or door. Or, adjustment of the telephonic receiver maybe effected through an aperture in one oi. the side walls, or the'top ofthe case.

The end cover of the case opposite the sound emission end or the soundconduit may he hinged to the top of the case so that it can be turnedupward and, if desired, folded backward'against the top of the case. Orit may be hinged to one side of the case, so that it can be turnedoutward and foldedv backward against the said side of the case. The caseis provided at one side, or it may be at the top, with a handle by whichit can conveniently be carried.

In constructions of apparatus of the kind referred to, the case, whichmay be covered with leather, after the manner in which cameras are socovered, and be of rectangular shape, may be adapted to admit of itsbeing conveniently supported in position for use. For-this purpose itmaybe provided on its underside wit. a screw threaded socket to which afolding tripod or other stand can be attached. Such tripod or otherstand, when not in use, can be folded up and'placed within the case, itmav be after its folded parts have been secured together, as by a clipdevice, or enclosed within a tubular sheath.

In the eccompanyingdrawings, Fig. 1 is a perspective external view ofone construction of loud speaking telephonic apparatus accordingto theinvention, complete and ready for transport. Fig. 2 is a plan view ofthe same in the position it will usually occupy whilst in use, one sideof the case of such apparatus being opened to show the in-T ternalparts. Fig. 3 is a perspective view showing the apparatus supported by atripod in position for use. Fig. 4 is a cross section. of the case ofthe apparatus with the loud speaking telephone removed. Fig. 5 is aperspective view, to a larger scale than Figs. 1, 2 or 3, of the loudspeaking telephone used in apparatus as shown in 1, 2 and 3 and Fig. 6is a, part sectional plan of such lou-dr speaking telephone. Figs. 7 and8 are underside views showing modified constructions.

Referring to Figs. 1 to 6, the case 0," which enclosed a loud speakingtelephone. is provided with a movable front end wall i) joint-ed byhinges to one of the side walls of the case and arranged normally toclose the enlarged end a of the sound conduit of case to whichthe frontwall I) and side wall d are hinged and by means of which the case andits contents can conveniently be carried. The arrangement is such thatwhen required for use the case is arranged with its hinged side wall (1uppermost and the side wall.

with the screw-threaded sockete lowermost,

so that the front wall 6 canbe turned about a vertical axis located atone side of the case, as shown in Figs. 2 and 3.

The sound conduit of. the loud speaking telephone may advantageously beof U shape (we Figs. 2, 5 and 6) and be arranged horizontally within thecase a, its outlet end terminating in the flared or trumpet shaped.

open end portion 0 that is preferably of rectangular shape in crosssection as shown, and fit s at its extreme front end, the front ,openendof the case, whilst its other and smalleriend portion, which extends'ina forward direction but not to so. great an extent as the larger openend, is bent upward and adapted to carry at its upper end, the tele- 1phonic receiver k, the diaphragm of which shaped outlet end portion isarranged to be in a horizontal plane when the apparatus is in use (Figs.2 and 3). The

intermediate portion of the sound conduit is of U shape.

1 According to the construction shown in Figs. 2, 5 and 6, the flared ortrumpetc of the sound conduit is of rectangular cross section and madeof wood. The intermediate U shaped portion 0 of the sound conduit is ofmetal end-Where it is provided with an en and of gradually increasingcircular cross section area from its inlet end to its outlet largedrectangular portion 0 fitting over the inlet end of the flared ortrumpet shaped portion 0 of the said conduit. The upwardly bent inletend portion 0 of the sound e'onduit, carrying the telephonic receiver h,is of circular cross section. The front outlet, intermediate and inletportions, 0, c and c of the sound conduit are or may advantageouslybejointed together with the aid of interposed material of a non-sonorouscharacter, as 'for instance rubber, so that the several portions shallbe acoustically. insulated from one another. The connertion of thehorizontally disposed telephonic receiver It to the upper end of theupwardly bent inlet portion 0 of the sound conduit is or may be efiectedby the aid of a socket or hollow plug, preferably of rubber orequivalentnon-sonorousmaterial, carried by the teleof a tripod support fand a" handle 9 attached -to that side wall of the" rigidity.

The telephonic receiver it may be pro-- any known or suitable means tothe terminals k and socketed ends of the portions 0 and c.

of the sound conduit. I q r,

In some cases, the .said upwardl'y bent inlet end portion c 'of thesound conduit ,to

which the telephonicreceiver IL is attached.

may be formed as a substantial tubula" :e le ment of non-sonorousmaterial, as to. instance rubber of.

vided with 7 whereby its electro-magnetic system can be readily adjustedrelatively to its diaphragm. Conveniently, the adjustment may beeffected by a screw is, and nut k it may be against the action of aspring, in the manner set forth in the specification of former BritishLetters Patent No. 15369 of 1915 granted to me.

efi'ectedby a screw or cam and a lever in the manner set forth in thespecification of another application. for Letters Patent Serial N 0.712357 filed by me.

Or the adjustment may be medium hardnessand The loud speaking telephonehereinbefore described may be acoustically insulated as a whole from thecase a in which it is disposed, as by the interposition of washers orbufiers m, (Fig. 4) of non-sonorous material, such for example as indiarubber or felt, andbe fixed in place by suitable clips or fasteningdevices, one of which is shown at n in Fig. 4.

By the construction described, a .loud speaking telephone having arelatively long an small dimensions.

The twin conductors 0 (Fig. 3) connected i can, afterjuse of theapparatus has been discontinued, be coiled up and placed Within the casea for easy and convenient trans port, or they maybe WOllDd'llPOll aspring controlled drum mounted within the case. To enable the tripodsupport f, when shortened and folded up-to be conveniently stored withinthe i vided with a socket like holder rforthe reception of the head f?of the tripod support with its screw threaded stem j and .wi a bracket 8to carry'the shortened legs of t is tripod support, a movable springserving to hold the legs firmly in place.

The bottom of the case a instead of being provided with a screw-threadedsocket e for the attachment of clip t expanding sound conduit can bearranged within a case a of comparatively of the telephonic receivercase a the latter is PI'G? a tripod support as "de- 539 41, when theapparatus is not required for use, and for storage or transport.

Or, according to the further modified-coir struction shown in Fig. 8,two legs {may be hinged to the bottom of the case a near to the cornerportions thereof at one end of the case and a third leg f be hinged to'the bottom of the case near to the opposite end of the caseand centrallythereof, in such manner that the three legs can be turned up closeagainst the bottom of the case and storage or transport.

What I claim is 1. Portable loud speaking telephonic apparatuscomprising a case havin an.opening therein and a movable wal normallyclosing said opening, a loud speaking telephone comprising a telephonicreceiver and a isound conduit, wholly located within said case, thesound conduit having a flared outheld \in position, as by spring clips4:, for

let end occupyingthe opening in said case, collapsible supportin meansadapted to hold said case above t 1e ground in position for use andcoacting detachable screw threaded connecting means carriedby the caseand collapsible supporting means, substantially as described.

2. Portable loud speaking telephonic apparatus comprising a case one endwall and one side wall of which is hinged thereto, a loud speakingtelephone comprising a telephonic receivr and a bent soundconduit,wholly located within said case, the outlet end of said sound conduitbeing of flaring shape and fitting the endof the case provided with thehinged end wall and the inlet end of said sound conduit bein benttowards .the said hinged side wall and having the telephonic receiverapplied thereto.

3. A loud speaking telephone according to claim 1, in which the outletor sound emission end portion of the sound conduit has one side wallfiat and vertical, the op posite side wall convex and vertical, the topwall convex and extending horizontally and the bottom wall flat andhorizontal.

Signed at London, England, this 20th day of June, 1924.

. EDWARD ALFRED eeaizmM.

